The fact that all the things that The British Museum exhibits are free to go and look at is fantastic.
My favorite exhibits, probably like most, are the ancient Egyptian pieces. Colossal statues, mummies, sarcophaguses (sarcophogi?), paintings, carvings, ornaments all dating back to as far as over 4000 years ago is pretty impressive.
However, it's not just about Egypt. I didn't have time to check out everything, there is an awful lot on display. But as it's free, I will be going back soon to finish off my visit.
I got around without one of those electronic guides, but part of me wishes I did pick one up. It's all very well reading the plaques, but sometimes it's easier to follow information when it's being told to you. Next time, I'll also go on one of their free tours.
I recommend a visit to The British Museum to anyone visiting London, but also to those who already live here.